title: Novel hydrazone derivatives of 7-hydroxy-3',3'-dimethyl-3'H-spiro[chromene-2,1'-isobenzofuran]-8-carbaldehyde.
abstract: The structures of new oxaindane spiropyrans derived from 7-hydroxy-3',3'-dimethyl-3'H-spiro[chromene-2,1'-isobenzofuran]-8-carbaldehyde (SP1), namely N-benzyl-2-[(7-hydroxy-3',3'-dimethyl-3'H-spiro[chromene-2,1'-isobenzofuran]-8-yl)methylidene]hydrazinecarbothioamide, C(27)H(25)N(3)O(3)S, (I), at 120 (2) K, and N'-[(7-hydroxy-3',3'-dimethyl-3'H-spiro[chromene-2,1'-isobenzofuran]-8-yl)methylidene]-4-methylbenzohydrazide acetone monosolvate, C(27)H(24)N(2)O(4)·C(3)H(6)O, (II), at 100 (2) K, are reported. The photochromically active C(spiro)-O bond length in (I) is close to that in the parent compound (SP1), and in (II) it is shorter. In (I), centrosymmetric pairs of molecules are bound by two equivalent N-H...S hydrogen bonds, forming an eight-membered ring with two donors and two acceptors.
authors.affiliation: Southern Federal University, Rostov-on-Don, Russian Federation.
authors.forename: Antony
authors.initials: A
authors.lastname: Bulanov
authors.forename: Igor N
authors.initials: IN
authors.lastname: Shcherbakov
authors.forename: Leonid D
authors.initials: LD
authors.lastname: Popov
authors.forename: E Y
authors.initials: EY
authors.lastname: Shasheva
authors.forename: P A
authors.initials: PA
authors.lastname: Belikov
authors.forename: Zoya A
authors.initials: ZA
authors.lastname: Starikova